ANTILOCK BRAKE SYSTEM
04–13–12
Operation
Front
• As the front ABS sensor rotor rotates, the magnetic flux between the front ABS wheel-speed sensor and the
front ABS sensor rotor change periodically. This periodic change is in proportion to the rotation speed.
• The semiconductor element in the wheel speed sensor detects the change in magnetic flux, and the active
drive circuit converts it to a rectangular wave signal for the current, which is transmitted to the ABS HU/CM.
• For every single rotation of the ABS sensor rotor, 44 rectangular wave pulse signals are output. The CM in the
ABS HU/CM calculates the wheel speed from the periodicity of these pulses.
Rear
• As the ABS sensor rotor rotates, magnetic flux
formed from the permanent magnet varies and
alternating current is formed with an
electromagnetic conductor. Using this alternating
current, rotation speed is expressed as a varying
proportional cycle and from detection of this cycle
the CM part of the ABS HU/CM can then detect
the wheel rotation speed. While the structures of
the front and rear ABS wheel-speed sensor differ,
the operation is the same.
End Of Sie
DETECTION PRINCIPLE
ABS WHEEL-SPEED SENSOR
ACTIVE DRIVE CIRCUIT
SEMICONDUCTOR
ELEMENT
MAGNETIC RUBBER
(MAGNETIC ENCODER)
ABS SENSOR ROTOR
OUTPUT WAVE PATTERN
ACTIVE DRIVE CIRCUIT
HI
LO
RECTANGULAR
WAVE SIGNAL
SEMICONDUCTOR
ELEMENT
C3U0413S015
V
OUTPUT VOLTAGE WAVEFORM
AT LOW SPEED
AT HIGH SPEED
E5U413ZS5008
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